Math Jokes

Theorem: 4 = 5

Proof:

-20 = -20

16 - 36 = 25 - 45

4^2 - 9*4 = 5^2 - 9*5

4^2 - 9*4 + 81/4 = 5^2 - 9*5 + 81/4

(4 - 9/2)^2 = (5 - 9/2)^2

4 - 9/2 = 5 - 9/2

4 = 5